adds qinfo management command

It seems more practical to give this its own command instead of `qmonitor --info`

django_q/management/commands/qinfo.py

@@ -0,0 +1,12 @@
+from django.core.management.base import BaseCommand
+from django.utils.translation import ugettext as _
+
+from django_q.monitor import info
+
+
+class Command(BaseCommand):
+    # Translators: help text for qinfo management command
+    help = _('General information over all clusters.')
+
+    def handle(self, *args, **options):
+        info()